The all new Diamond Range stage one air cleaner assembly for Harley-Davidson Sportster engines. CNC machined from billet aluminium here in the UK. The sleek compact design improves leg clearance and looks great available in a range of designs, the genuine K&N 4 inch high flow filter gives that piece of mind with there quality. With each of the air cleaner assembly's featuring our clever engine breathe/vent tubes horsepower and engine flow is never a question. Each air cleaner assembly comes with our bespoke mounting hardware needed to fit this to your bike.